Cutting-off tool.



. E. F. G. GIBBS.

CUTTING OFF TOOL. APPLICATION FILED NOV. 16. 1914.

1 ,266, 1 1 6. Patented May 14, 1918.

1% n" x I I 11mm! 6 c AVVE/VTOR.

@56 $4M, {Shard EDWARD F. G. GIBBS, OF WASHINGTON, DISTRICT OF COLUMBIA.

CUTTING-OFF TOOL.

Specification of Letters Patent.

Patented May :14, 1918.

Application filed November 16, 1914. Serial No. 872,442.

To all whom it may concern:

Be it known that I, EDWARD F. G. GIBBS, a citizen of the United States, residin at Washington, in the District of Colum ia, have invented certain new and useful Improvements in Cutting-Oif Tools, of which the following is a specification.

This invention relates to new and useful improvements in cutting-off tools, such as are used on common engine lathes for cutting ofi' any such metallic substances as are held and rotated by the said lathes. I do not mean, however, to limit myself in any sense, except as required by the scope of the claims.

The invention is hereinafter fully described, shown in the accompanying drawings, which form a part of this specification, and then specifically defined in the appended claims.

The object sought in this invention is to obtain the design of a cutting off tool which will be very rigid, always hold its adjustable cutting blade vertical over its lower edge, adapted to either right or left hand use, provided with means for being raised or lowered to its proper elevation, and made as economically as possible.

To this end, I have designed the mechanism illustrated in the accompanying drawings, in which Figure 1 is a full perspective view of the tool complete without the elevating liners referred to later.

Fig. 2 is a perspective view of the liners used for elevating the tool to its proper working position.

Fig. 3 is a central vertical sectional view of the base piece, angled clamp, cutter blade and detachable king bolt head, and also a portion of the lathes tool seat, cut on a line parallel to the axial center of the lathe and through the T-slot of its tool seat.

Reference now being had to the details of the drawings by letter, similar letters refer to similar parts throughout the several views. A designates the angled base piece as a whole, while a and a designate its horizontal and vertical wings respectively. a designates the edge common to both wings and a a designate the common corners. a designates the recessed shoulder, while a a point out the hard bearing spots.

B designates the tool seat of the lathe. C

designates the king bolt of which 0 is the detachable head, while 0 is the nut.

D designates the horizontal adjustable cutter blade, and E is the inverted angle iron, cutter clamp, of which 6 and 6 point out the horizontal and hanging wings respectively, while 6 designates the overhanging lip. F designates the clamp screw, and G the U-shaped liners.

The construction of the tool is thus described :The base piece A is known in shop practice as an angle iron, that is a horizontal, fiat, rectangular wing at, joined at one side by a very similar vertical wing a forming an external right angled edge. a and two external corners a, common to both wings.

It is held to the tool seat B, of an engine lathe, by the king bolt C, which passes through the horizontal apertured wing a, the detachable bolt head 0 and nut 0 The upper, outer portion of the vertical wing is cut away or recessed horizontally for the purpose of forming a suitable shoulder a for the cutter blade D to rest on. The said blade, which projects slightly above the top of the said vertical wing, has a hard bearing spot at each end of the said shoulder, which shoulder is cut slightly deeper between the said spots as is shown in Fig. 1. This shoulder construction, in addition to giving hard bearings where they are needed, enables the cutter blade to spring downward slightly when under pressure from the angled clamp, mentioned later, and then be arrested by striking the bottom of the said deeper out, which prevents its breaking.

The angled cutter clamp E is a small inverted angle iron, very similar in form to the base piece. In its normal position it hangs entirely suspended upon the cutter blade D, which rests upon the shoulder described. With its horizontal wing e resting on the said blade, its overhanging lip e engaging the outer edge of the said blade and its hanging wing 6 supported only by side pressure against the vertical wing of the base piece, it is free to move up and down to accommodate blades of various widths, without changing its position. Its natural tendency under heavy pressure from the clamp screw F, which has screw-threaded engagement with the vertical wing a, is to simultaneously spring the cutter blade down to the deeper cut referred to, while the hanging wing e presseshard against the vertical wing of the base piece and the overhanging lip draws hard against the outer edge of the blade. Thus by this arrangement, the blade, caught between interlocking angle irons, is pressed from four dilierent opposing directions by the action of the single clamp screw F, the greater pressure being up and down. The cutter blade diminishes in thickness from the top edge downward ttor the sake of clearance.

The flat U-shaped elevating liners G, 'arying in thickness, are slipped under the base when necessary to elevate the cutter.

Rigidity. the most in'iportant feature in a flitting-oil tool, is obtained by eliminating the tool post entirely and clamping the solid compacttool to the tool seat direct. It is converted from a right to a left tool simply by reversing it on the tool seat and then re versing the blade.

The cutter blade cannot be easily broken by twisting or wrenching, because of its rigidity and because the spring, due to load on the cutting point, is directly downward.

Having thus fully described my invention, what I claim to be new and desire to secure by Letters Patent is 1. As an article of manufacture, a cuttingott tool base piece, comprising an angle iron, the horizontal wing ot which is apertured for a king bolt, while its vertical wing, adaptedto screwthread ei'igagenient with a clamp bolt, is recessed horizontally, forming a shoulder on which a cutter blade is adapted to bear.

' '2. As an article of manufacture, a cuttingotl' tool base piece, comprising an angle iron, thehorizontal wing of which apertured for a king bOlt,\\'l1ll its screw-threaded ver tical wing is recessed horizontally, forming a shoulder on which acutter blade is adapted to bear, the said shoulder being cut slightly deeper between bearing spots at each end.

8. A cutting-oil tool comprising an angle iron, base piece, the vertical wing of which recessed horizontally forming a shoulder on which a cutter blade adapted to bear, a cutter blade adapted to bear on the said shoulder, a screw-pressed, inverted, angle iron cutter clamp, the horizontal wing of which is adapted to bear on the said cutter blade, while its hanging vertical wing has side pressure against the vertical wing of the said base piece, and means for holding the said tool to the tool seat of an engine lathe.

it. A cutting-cit tool comprising an angle iron base piece, the vertical wing of which. is recessed horizontally, forming a shoulder on which a cutter blade is adapted to bear, the said shoulder having bearing spots thereon and slightly recessed between the latter at each end, a cutter blade adapted to bear on the said shoulder, a screw-pressed, inverted angle iron cutter clamp, the horizontal wing of which, having an overhanging lip, is adapted'to bear on the said cutter blade, while its hanging vertical wing has side pressure against the vertical wing of the base piece, and means for holding the said tool to the tool seat of an engine lathe.

A reversible cutting-oi? tool comprising an angle iron base piece, the vertical wing of which is recessed horizontally, forming a shoulder on which a cutter blade is adapted to bear, a cutter blade adapted to bear on the said shoulder, an inverted, interlocking, angle iron cutter clamp, the horizontal wing of which is adapted to bear on the said cutter blade, while its hanging vertical wing has side pressure against the vertical wing of the said base piece, and a king bolt which holds the said tool in reversible position on the tool seat of an engine lathe.

In testimony whereof I aliix my signature in presence of two witnesses.

EDWARD F. G. GIBBS. ll itnesses:

E. L. Ana-ins, A. E. MONROE.

Copies of this patent may be obtained forfive cents each, by addressing the Commissioner of Patents, Washington, D. C. 

